CVE-2023-33185 json
Incorrect signature verification in django-ses
published 2023-05-22 3 y ago modified 2026-09-10 1 mo ago also GHSA-qg36-9jxh-fj25 , PYSEC-2023-82 , EUVD-2023-0063
- cvss
- 4.6
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 14%
- public exploits
- 0
- none known
Summary
Django-SES is a drop-in mail backend for Django. The django_ses library implements a mail backend for Django using AWS Simple Email Service. The library exports the `SESEventWebhookView class` intended to receive signed requests from AWS to handle email bounces, subscriptions, etc. These requests are signed by AWS and are verified by django_ses, however the verification of this signature was found to be flawed as it allowed users to specify arbitrary public certificates. This issue was patched in version 3.5.0.
Patch / fix
- pypi django-ses 3.5.0
- django-ses_project django-ses 3.5.0
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 21 mo ago
Exploit prediction
0.23% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/django-ses/django-ses/blob/3d627067935876487f9938310d5e1fbb249a7778/CVE/001-cert-url-signature-verification.md referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.6 | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L |
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N |
| GitHub | 3.1 | 4.6 | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | django-ses | <3.5.0 |
3.5.0 |
Affected products
- django-ses django-ses
Classification
- Weakness
-
- CWE-347 Improper Verification of Cryptographic Signature
References
-
github.com
/django-ses/django-ses/commit/b71b5f413293a13997b6e6314086cb9c22629795
web, patch
-
github.com
/django-ses/django-ses/blob/3d627067935876487f9938310d5e1fbb249a7778/CVE/001-cert-url-signature-verification.m
web, exploit, third-party-advisory
-
github.com
/django-ses/django-ses/security/advisories/GHSA-qg36-9jxh-fj25
web, vendor-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2023-33185
advisory
-
github.com
/django-ses/django-ses
package
-
github.com
/pypa/advisory-database/tree/main/vulns/django-ses/PYSEC-2023-82.yaml
web
Sources
- CVE List CVE-2023-33185
- GitHub Advisory GHSA-qg36-9jxh-fj25
- NVD CVE-2023-33185
- OSV PYSEC-2023-82
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.